In the grim darkness of the 41st millennium, the Inquisition protects mankind from its many enemies, whether foul daemons or the inscrutable, alien eldar. But who will protect humanity if even the Inquisition becomes corrupted? Renegade Inquisitor Jaq Draco and his motley companions find themselves caught in a war that no one can win... unless he can somehow access the ancient secrets hidden in the legendary Black Library.